Gas-lamp.



G..KE|TH. GAS LAMP.

APPLICATION FILED JAN-25, ISIS.

1,192,430. Patented July 25,1916.

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UNITED sTATEs AT Eli.;

GEORGE KEITH, OE LONDON, ENGLAND, assIGNOE OE ONE-HALE To JAMES KEITH, or

' LONDON, ENGLAND.

GAS-LAMP.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed January 25, 1916. Serial No. I74,100.

To all 'whom it may concern.'

Be it known that I, GEORGE KEITH, a subject of the King of the United Kingdom of Great Britain and Ireland, and residing at London, England, have invented a certain new and useful Improvement in GasLamps, of which the following is a specification.

This invention relates to incandescent gas lamps, more particularly to inverted lamps forhigh pressure gas lighting.

The invention renders practicable the use of a nozzle tip composed of material capable of withstanding very high temperatures, entails reduction of the area of metal exposed to the flame and therefore of the emanation of metallic particles, and confers greater assurance against tendency of the flame to light back.

The figure of the acco-mpanying drawing is a vertical section of part of a gas lamp embodying the invention.

As shown, the body A of a preheater is fitted with a mantle-support B. The preheater herein shown by way of example serves for heating the gas and air mixture but for the purpose of the present invention it is immaterial whether the mixture or air alone or gas alone be passed through the preheater. Engaging an internally threaded orifice in the lower end of the preheater body is a bush @which in the present instance is of refractory material, said bush having near its lower end an internal annular shoulder presenting a seat D, its lower external edge being above and close to the bottom of the mantle-ring-receiving recess formed in the mantle-support B. 'Ihe nozzle proper or burner tip E, which is composed of metal, such, for example, as nickel and chrome alloy, capable of withstanding very high temperatures, is formed with a tapered shoulder bearing on said seat, and is in screw-threaded or other connection with the lower end of a metal tube F, which may be, for example, of cast iron or aluminium bronze and which extends upwardly into the interior of the preheater. The engagement of the tapered shoulder on the tip with the shoulder on the bush is sufliciently close to prevent passage therebetween of the mixture of gas and air contained within the heater,"

but the tip E is freely separable from the bush C on the shoulder of which it rests.

It will be understood that the nozzle proper or tip E is not directly connected to cou does not collect heat rapidly from the flame. 66

It is thus possible to select for the composition of the nozzle proper a metal capable of withstanding very high temperatures, the selection not being limited to the choice of a metal of good thermal conductivity; the reduction in conductivity being compensated for by the comparative shortness of the path along which the heat travels before it reaches the tube. As the nozzle proper is of less substantial dimensions than the nozzle heretofore employed, the cost of the metal is not a serious factor.

A feature of considerable practical utility is that the bush C can be readily unscrewed, even after the lamp has been heated for a long time, whereas, heretofore, difficulty was sometimes experienced in unscrewing the metal nozzle after it had been in use. As aforesaid, the lower end of the bush C may enter the mantle-ring-receiving recess, so that when the mantle support is screwed up the mantle ring II is lightly held between the support B and the bush C, whereby the mantle is steadied, and the space between the bush C and the mantle-support B is cut OH from communication with the flame, the upper portion of the bush being thus screened from excessive heat. As aforesaid, the 'bush may be of refractory material; the non-conducting property of the bush is, however, of

more importance than its heat-resisting' said heater, said bush formed with an intei-nal shoulder, a tube extending from the interior of said heater into said bush, and a nozzle connected to said tube and supported by said shoulder.

8. In a high pressure incandescent gas lamp, in combination, a mantle-support, a non-conducting bush between which and the mantle-support the mantle may be lightly 10 held, a tube projecting into the bush, and a GEORGE KEITH.

Witnesses: n

WALLACE CRANsToN FAIRWEATHER,

HENRY MASON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

